Dual-Crosshatch Disk Array: A Highly Reliable Hybrid-RAID Architecture.
Sunil Kumar Mishra, Sudheer Vemulapalli, Prasant Mohapatra · 1995
In this paper, we propose a highly reliable RAID architecture called a Dual-Crosshatch Disk Array. It uses the proposed interleaved 2d-parity scheme, a low overhead triple-erasure correcting parity organization. It is a hybrid approach of RAID-4 and RAID5 with one dedicated parity group and another parity group using block interleaved data and parity. The results obtained from simulations indicate that this architecture possesses extremely high reliability with low overheads, good degraded performance, and acceptable normal-mode performance. 1 Introduction To keep pace with the rapidly increasing processing power, disk array architectures have been proposed that can achieve high I/O capacity and performance. Disk array storage systems, such as Redundant Array of Inexpensive Disks (RAID) level-5 data organization [1], provide fault tolerance against disk drive failures, and are cost-effective and have good run-time performance. However, a storage subsystem consists of more than just d...